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research article

Gravitational tides and dwarf spheroidal galaxies

Nichols, Matthew  
•
Revaz, Yves  
•
Jablonka, Pascale  
2014
Astronomy & Astrophysics

The effect of the local environment on the evolution of dwarf spheroidal galaxies is poorly understood. We have undertaken a suite of simulations to investigate the tidal impact of the Milky Way on the chemodynamical evolution of dwarf spheroidals that resemble present day classical dwarfs using the SPH code GEAR. After simulating the models through a large parameter space of potential orbits, the resulting properties are compared with observations from a dynamical point of view, and from the, often neglected, chemical point of view. In general, we find that tidal effects quench the star formation even inside gas-endowed dwarfs. This quenching may produce the radial distribution of dwarf spheroidals from the orbits seen within large cosmological simulations. We also find that the metallicity gradient within a dwarf is gradually erased through tidal interactions as stellar orbits move to higher radii. The model dwarfs also shift to higher <[Fe/H]>/L ratios, but only when they lose greater than or similar to 20% of stellar mass.

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Type
research article
DOI
10.1051/0004-6361/201322710
Web of Science ID

WOS:000334671000112

Author(s)
Nichols, Matthew  
•
Revaz, Yves  
•
Jablonka, Pascale  
Date Issued

2014

Publisher

EDP Sciences

Published in
Astronomy & Astrophysics
Volume

564

Article Number

A112

Subjects

galaxies: dwarf

•

galaxies: evolution

•

galaxies: formation

•

galaxies: interactions

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
May 26, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/103657
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